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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bca3cbd2c6e4edd2b01e7339d198d64bd18d8a7098809296ef0cdb2867ba5d9' 
  AND token = 'NfavU1PtFX6J8uUP7Fe19hHTR7iGAoq9WBgKWBylEOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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