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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '328a394cd2f51ad336386ceab9afa1e58e21b47b0619bc0d05b454cc3e72c44f' 
  AND token = 'rdE5uatIpFiM4l5y3Dn8zTiqNKHd259nVkm8/n+jOm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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