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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07fe0d3f45bf5af5f58726ec61537663df52ce0309eaa09ec54a0a7301136be5' 
  AND token = 'RlxhNywGcRfiwXYab/CIeKkp+knlHF+cT2eI8MH4AcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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