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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f7adf87fab92cab4eec0be627c7672691c7b336fcaa5fae01d0626a614f90da' 
  AND token = 'P0Id0Fnfzn032zQ3z7Sh0TjA1NiGm3GL0KrgVbwdv8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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