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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f66ab6b8a135ba05719280da0563b7da09351b7d743ac3e3537b2c07d5b42a03' 
  AND token = 'yyJ7Vd5VqSrcNYkcX71yPRKKOMrJrpR+dDut/UysZeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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