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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '119f1136bcba83c162486063b2c4e2372062e8aa4050ef8a59d489c108c73ba6' 
  AND token = 'j3xGr3fbUxKEoDSrTzVXSsjMPyM42bmJ3H5ScOPIeOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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