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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cac4d8a1cd78612455b8939fc0c109f40f7e4dd93751ace8e3bc52e984f8645d' 
  AND token = 'EyW3o+LKa35d9vIai0YFJxC/i3/g1xaaNWW/W5Ux7H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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