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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b96bd2454651b0feacc4204101a129e8e0bda23a594c6d1d4ef386d60a426c' 
  AND token = '+H3fhWjd7TP8roiwjuM1FK22LvkO0+U8cDMovmz25DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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