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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27400af520dadf9087dbe996a3a69532edbdca68ed74d4b324615742d9bd0a17' 
  AND token = '/q0eKiuiu759kI0/ib7dPzSMFLpVtVNAi0TmAnsd16E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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