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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '381f434bb830160ee8bd556b7bc83e67303b8bbb654d97c5dea0f4064416f8d3' 
  AND token = 'WshDb29uSWkS43M+Nm8e+WQa5CBVgX2N2jTZ2BcLDzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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