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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c36e3ff2d53f81c9074de136771e4cd7ed1f0c46e06166e0460cedee32ab503b' 
  AND token = 'H35ZyN+/3Qn1b06By1k7Si6+w9N0EHaNesB5cAMzMdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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