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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '811c2ae500e56ab811f8c0d02218297c72abd2995e8a603821566ca488908eb2' 
  AND token = 'm4zw5rgImcD3c/hyYnoY5ssmfl4cIVZGZ3S6BjaXS7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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