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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aff88d66898bfc133e9512faa3de04990b213cbcf34bfe0b83cefbed7481a6d' 
  AND token = 'kd+r1YituycODRE4RK11t0ImjM+ghAOGLnvEY1e4JUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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