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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a57bf47fe5156de1ada3ee6023b7f326e608f82d4ee84531286f07d03ce351' 
  AND token = 'WJnFVeYH88i6bq1U6tSvWmq6ciyHKS0nD2YLm96yX1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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