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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e82946a1786d6b10a1c3dc9dfcb0acf08029a0ecffa49ad782ac9f7571907cf9' 
  AND token = 'UmYPZL3R8sxaUHp7cRt28Ue6GIBX6uRDhQU/ZulPxQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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