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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95dc60e114b7bd9c2454f199969c05a3e39ddbbaa6f3ca5de42f9d27f256be31' 
  AND token = '/+hICd+maD7+gYoWjyFXbMR/Wi6HbNzTaV67vh7+YBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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