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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aefaf85060670d2387f2de750cb02af6e14ab7c3c3f5e101eff97b9da0b06b82' 
  AND token = 'UP5mYb8a8guof7IGIDIaK+lN5cgFGSN25w4RSg9ma0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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