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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c380c9ddc6173831199fd0d59a5cd1dd7ade5b1afa622530063190b78086b022' 
  AND token = 'Jl/c4Yhw0F8Yc7q8syrdUuax0UkMH3pddStACCEFlJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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