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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b0fce28b7cac844f7a49533c97ee5ef91c9de92beccc35aebb54f29f3991701' 
  AND token = 'Ik8GHS6Rn4ck2AH7iOCIdjDwLsnXHjmjuC17MjLiS6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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