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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6a9160963d4f9038b2b6399b11a64cdf5b93085dbc2cfe74b63893e3f64aba' 
  AND token = '+WcEh93L3TcJGDaGTrqW9O246VG+6gKcWNPlgoZyKhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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