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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48d138e07d82191b9e36861ba8743b62e6af43c85689c595ed4c3dc90cfcf91c' 
  AND token = 'KM20EoeTY3CrQn3S3xxTVTA7Jh4R9v68YnI0HaRmHyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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