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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6376e1445ce8b3d81fc67c450245d330380e4d4b632f77c9ff6dd65385f2d11e' 
  AND token = 'Cc2ZwljupNBFngtQpip38lSecDeeOh02mi+EVzWi2oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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