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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ebe6230e91a8d22c9ccc7cc639cef1fdd971235edbedc39e911e21d598bbd64' 
  AND token = '+Z8uTE6CcFLo7Ago14Kmxuz7MKPslzbN3fYuhRQ62XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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