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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc0d516d4400b68c71f2676eff345ca9c770a7bea4b36ed02cf0b19462eea57a' 
  AND token = 'zfh222suDo+JO92Xls0PZAooO24WBXLRLuOV0c+Bz2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}