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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46dca1a62201dafb04a7db3604b85a5db0dd6b78f40b8387884a9d4e97f9ee93' 
  AND token = 'zKyoa0Nca9T5xHFAIPKLOgGBnn8p5Y6BHFzpiN4capA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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