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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c61c6f31bf161bd196a9d391a23e280b8a2e249f7270bf068685e975188902e' 
  AND token = 'I2oCdSm6LWUge7I9i4b9ZAVpZgbTCEuMMKPYCqP5I/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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