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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f84479db55ab2f1a6c6337260759c26f48dbcb81423665b8c3a62fd8400fb1d8' 
  AND token = '1wQAxf5l+4hIcwLp0pA4/eikDLT2xqnFhHV2G50syU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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