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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94150e7e67c7da9d1710279c6ba709f0b72612d5387fd8b4aba6069c208c3fb0' 
  AND token = '4wdY4gzpt9SKUT7F4M6GXV22C4nuSrxOXd4VaIUyaQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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