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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b7dce0fad4f9c52966f46ba5b88af2bb44a798cb44245eb3fe82b1a2e87b4cf' 
  AND token = 'w7GDjPyJjQcXuW4DbPtT73nX35O4Eq89o706oprBiQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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