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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '379a2326b2f1e86f20d8c87af57f9d29ba5bb5a4b67a7c83d32f121267daf433' 
  AND token = 'sJiLsHIbNbvL9AR37Z0dWkgDFmECSDtW168vpIysOWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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