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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16e12541f82d10e9bdc4e25d0e4c02f38c602f022eea96c3672aa6abd3a544db' 
  AND token = 'y3deIAiIDzqtYsHahmKu8JEpEdDY+/95fq4sVanMtO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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