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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dde1f31674839a9251fdb34a36936be47023bab2727fbbb130d68a21025428b9' 
  AND token = 'TN4qTJVisJwbvO9akr5Dm6dS/kqNIMTyewi7R9koedY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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