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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d806e37161aace4e028dfe25031bc1d93f6c0ceb270a840ad085630842d0698' 
  AND token = 'd6nZq6Fru2oO3yeAr3wX6YNMP4qxFw/diZJGAIlUOqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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