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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '024948f9faf4e2a0b2dfd35646a54af069c417b4b8efbfe7d9a99616162d804d' 
  AND token = 'AKsw+F9ktYaQaF/xC8wVcCwHAgGj2xnTokJiLLYAFGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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