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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1a1c9dbaef97423c01c1cf2b03844edd6988b75cd526e3c6ef71b8d2ceec96' 
  AND token = 'TRMQH9G/VeBt8xPKlQL7+t5FyfaCIqadclJuMORmr1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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