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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4407386fcccb713890519a2c91e5e91f29ede74cc56f780a7e0cd7a5c7d1b5d3' 
  AND token = 'VpXgV5P9PdoL7O7uruyXqhBrwswSATJKVxCQ54o+/aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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