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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c053fea38b1fbab7b4291fee61f5dc22b925d7640967221266146243a8e092fd' 
  AND token = 'b8xYdzhrPGGV8eMFLouXdxaQzwbWp1Cj02iTYhJxL4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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