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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab5c30b2bad80a1bbc4e15967f7bc27f1838870e27c29ec12a53b6ddbaa3c29' 
  AND token = 'Nad9C9Cp3VMITmY7MkVGDRFUT3+oFe8J+/MIa3DisLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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