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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8f7992e98e58364d459b2e986aee8207458d14b7734e5d6835ec721ed11b0fd' 
  AND token = 'FXTtapHGRwKXmecC62gQRi5J72tp8jNEwEwYjuVAQJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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