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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '894e8a509715caa3f55abfe21f52ff6e458cbd368b4a7f1bf3e0857d0dfced66' 
  AND token = 'xIZ5/uSWkMop8Q4crT2moH7Vva3lrhYsJQBD1rxnT/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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