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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41648162a4974888d6afb060f3afa168eb8c550634676e74ca6592fff54e8e77' 
  AND token = 'ErtkYFvgomru/6fBa7XGZz/6Nksg5zqjzVb8Rsl/j5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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