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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6809d284f4800abab434c1e3fa1d5b093555a0b0592158c334a74e64e9607c6a' 
  AND token = 'vXxt7Gx5i6HGPWRHbsDA5szwltKXxbsLazs8f+ldd0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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