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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fcc448af879cbd0d79532243ea006d1a1132a878ffe7052eccb880656a8f155' 
  AND token = 'fBneXQGa5aOmnNghCxmnnm813i6B1FcjUwSL5GS38J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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