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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fb3108f370a1a2fe702fdc80de02a08cbe8e09d446e73540af59bf01dc47ee4' 
  AND token = 'b8cWwB7e4raasgApv3MDAqf3qZgPDjfaB53FyCCPCec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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