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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cb4c3cf4956c8aebef7c40a519d46e795d5396fa167040c7e1f8a2ceec7b80c' 
  AND token = '+wuyhRjCe+hWdBu2B+j22YuuEQ0h3dtPz+1e/ww2+Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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