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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '091e8588fd7ee702ad99597a34a2e2a3ecdf77e2f1db9feeb17658ecd2c58add' 
  AND token = 'mNL8q2eBdtinpG3CoNfPK1BgdMrALa2S4CzlmbdsPtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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