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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29bd2c2ef1a7da6b3b7c71b349103aabd9979776dd3553ba298c0ca3e0db9f25' 
  AND token = 'B03z7p/Vqfv22X6pESvd7zzVKlTCVAM0t3LOzdPKk88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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