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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65111f9f7abcc9fd03fcd0fd7751d5c1412490364daa95ce7cdce991c0023d96' 
  AND token = 'd1pwrDM6b3lFeiJmeRbIstCMF6kOykM/prsSK4r/lEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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