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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9731cdb40543603aa357f83b60d5b4a7102ee9e7950fabd4c281f3931382895e' 
  AND token = 'T0ZI0UK86T8fbt8px8N1zCce0NDzyvGLBNqrQTLdJc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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