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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79bdf4d82182f32e82e1d2be88133887de6fa3f2ed112c3761ee4257d28e150c' 
  AND token = 'Uqv4/s5GX5Id1i7254YD253R5K0saYESGjwpN8J6Mzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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