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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575b925a739f73513146384e4eed30b1278239f25e455f79892ab7906b0efae6' 
  AND token = '+EVyIyb2RhTnRmUBP6ybpxL+Sn0s9YgsepC+P6gbW18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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