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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474daabb992c66b401a0a0b3df08d3c0ed9e655cd3f795059c52c1dc2d65e3ac' 
  AND token = 'nd5sKnqMtvFhHGH226Qwvoqx8CrisS8Y6WKCA1a398U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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