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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfae51ebdbac54ba6e6dd88885635e065ae2e5039c9373c8dc0f3c8be299378c' 
  AND token = 'nZzk1M//n4SU85SkoX8G21jRMU8LKJNiqXfehn1RcbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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