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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f19e8019c9272853a09ab8edf108a5179df9afa292e7d113b869d181eb947e' 
  AND token = 'X/s7oW8FBeB90GNnaXSRTM/WdhKDqoTyIJc+JihkhlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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